Based on the relation between the objects and the contents pointed, Pointers can be classified into two types: embeddedPointers and exterior Pointers.
对于内部含有指针的对象，根据对象与其中的指针所指向内容的关系，可以把指针分为内含式和外联式两类。
2
RDDL USES XHTML to provide prose descriptions of the vocabulary with embedded XLink (covered in this article) to provide Pointers to key resources for helping understand or process the namespace.